Used 2.25 × 24 = 54, treating the time as 2.25 minutes instead of 2.25 hours.
PRIMARY 5 · MATHEMATICS
Rate
Top 5 mistakes
Ranked by how often they appear across 37 MOE-aligned practice questions in our archive.
Used 24 × 10 = 240, treating the time as 10 minutes.
Converted 2 hours 15 minutes to 225 minutes instead of 135: 225 × 24 = 5400.
Solved 0.45c = 14.40 - 4, then divided by 0.40 incorrectly (got 30 by rounding the result).
Assumed all 80 pages were colour, then subtracted (14.40 / 0.45 = 32) without accounting for the cheaper black-and-white pages.
Want to fix these mistakes for your child?
Superholic Lab's quiz engine flags every misconception by name and routes your child to targeted practice in our 3-day Plan Quest. Free 7-day trial.
Start a free 7-day trial →